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<a href="warp__reduce_8cuh.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160;<span class="comment">/******************************************************************************</span></div>
<div class="line"><a name="l00002"></a><span class="lineno">    2</span>&#160;<span class="comment"> * Copyright (c) 2011, Duane Merrill.  All rights reserved.</span></div>
<div class="line"><a name="l00003"></a><span class="lineno">    3</span>&#160;<span class="comment"> * Copyright (c) 2011-2013, NVIDIA CORPORATION.  All rights reserved.</span></div>
<div class="line"><a name="l00004"></a><span class="lineno">    4</span>&#160;<span class="comment"> * </span></div>
<div class="line"><a name="l00005"></a><span class="lineno">    5</span>&#160;<span class="comment"> * Redistribution and use in source and binary forms, with or without</span></div>
<div class="line"><a name="l00006"></a><span class="lineno">    6</span>&#160;<span class="comment"> * modification, are permitted provided that the following conditions are met:</span></div>
<div class="line"><a name="l00007"></a><span class="lineno">    7</span>&#160;<span class="comment"> *     * Redistributions of source code must retain the above copyright</span></div>
<div class="line"><a name="l00008"></a><span class="lineno">    8</span>&#160;<span class="comment"> *       notice, this list of conditions and the following disclaimer.</span></div>
<div class="line"><a name="l00009"></a><span class="lineno">    9</span>&#160;<span class="comment"> *     * Redistributions in binary form must reproduce the above copyright</span></div>
<div class="line"><a name="l00010"></a><span class="lineno">   10</span>&#160;<span class="comment"> *       notice, this list of conditions and the following disclaimer in the</span></div>
<div class="line"><a name="l00011"></a><span class="lineno">   11</span>&#160;<span class="comment"> *       documentation and/or other materials provided with the distribution.</span></div>
<div class="line"><a name="l00012"></a><span class="lineno">   12</span>&#160;<span class="comment"> *     * Neither the name of the NVIDIA CORPORATION nor the</span></div>
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<div class="line"><a name="l00026"></a><span class="lineno">   26</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00027"></a><span class="lineno">   27</span>&#160;<span class="comment"> ******************************************************************************/</span></div>
<div class="line"><a name="l00028"></a><span class="lineno">   28</span>&#160;</div>
<div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160;<span class="preprocessor">#pragma once</span></div>
<div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;<span class="preprocessor"></span></div>
<div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160;<span class="preprocessor">#include &quot;specializations/warp_reduce_shfl.cuh&quot;</span></div>
<div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160;<span class="preprocessor">#include &quot;specializations/warp_reduce_smem.cuh&quot;</span></div>
<div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;<span class="preprocessor">#include &quot;../thread/thread_operators.cuh&quot;</span></div>
<div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160;<span class="preprocessor">#include &quot;../util_arch.cuh&quot;</span></div>
<div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160;<span class="preprocessor">#include &quot;../util_type.cuh&quot;</span></div>
<div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160;<span class="preprocessor">#include &quot;../util_namespace.cuh&quot;</span></div>
<div class="line"><a name="l00042"></a><span class="lineno">   42</span>&#160;</div>
<div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;CUB_NS_PREFIX</div>
<div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;</div>
<div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;<span class="keyword">namespace </span>cub {</div>
<div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;</div>
<div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;</div>
<div class="line"><a name="l00137"></a><span class="lineno">  137</span>&#160;<span class="keyword">template</span> &lt;</div>
<div class="line"><a name="l00138"></a><span class="lineno">  138</span>&#160;    <span class="keyword">typename</span>    T,</div>
<div class="line"><a name="l00139"></a><span class="lineno">  139</span>&#160;    <span class="keywordtype">int</span>         LOGICAL_WARPS           = 1,</div>
<div class="line"><a name="l00140"></a><span class="lineno">  140</span>&#160;    <span class="keywordtype">int</span>         LOGICAL_WARP_THREADS    = <a class="code" href="structcub_1_1_arch_props.html#a378def3dee75e77eb135efcf6f0ca063ac5a2eb5b9e3b50dd43ad67c1ff020d9c" title="Log of the number of threads per warp. ">PtxArchProps::WARP_THREADS</a>&gt;</div>
<div class="line"><a name="l00141"></a><span class="lineno"><a class="code" href="classcub_1_1_warp_reduce.html">  141</a></span>&#160;<span class="keyword">class </span><a class="code" href="classcub_1_1_warp_reduce.html" title="The WarpReduce class provides collective methods for computing a parallel reduction of items partitio...">WarpReduce</a></div>
<div class="line"><a name="l00142"></a><span class="lineno">  142</span>&#160;{</div>
<div class="line"><a name="l00143"></a><span class="lineno">  143</span>&#160;<span class="keyword">private</span>:</div>
<div class="line"><a name="l00144"></a><span class="lineno">  144</span>&#160;</div>
<div class="line"><a name="l00145"></a><span class="lineno">  145</span>&#160;    <span class="comment">/******************************************************************************</span></div>
<div class="line"><a name="l00146"></a><span class="lineno">  146</span>&#160;<span class="comment">     * Constants and typedefs</span></div>
<div class="line"><a name="l00147"></a><span class="lineno">  147</span>&#160;<span class="comment">     ******************************************************************************/</span></div>
<div class="line"><a name="l00148"></a><span class="lineno">  148</span>&#160;</div>
<div class="line"><a name="l00149"></a><span class="lineno">  149</span>&#160;    <span class="keyword">enum</span></div>
<div class="line"><a name="l00150"></a><span class="lineno">  150</span>&#160;    {</div>
<div class="line"><a name="l00151"></a><span class="lineno">  151</span>&#160;        POW_OF_TWO = ((LOGICAL_WARP_THREADS &amp; (LOGICAL_WARP_THREADS - 1)) == 0),</div>
<div class="line"><a name="l00152"></a><span class="lineno">  152</span>&#160;    };</div>
<div class="line"><a name="l00153"></a><span class="lineno">  153</span>&#160;</div>
<div class="line"><a name="l00154"></a><span class="lineno">  154</span>&#160;<span class="keyword">public</span>:</div>
<div class="line"><a name="l00155"></a><span class="lineno">  155</span>&#160;</div>
<div class="line"><a name="l00156"></a><span class="lineno">  156</span>&#160;<span class="preprocessor">    #ifndef DOXYGEN_SHOULD_SKIP_THIS    // Do not document</span></div>
<div class="line"><a name="l00157"></a><span class="lineno">  157</span>&#160;<span class="preprocessor"></span></div>
<div class="line"><a name="l00159"></a><span class="lineno">  159</span>&#160;    <span class="keyword">typedef</span> <span class="keyword">typename</span> <a class="code" href="structcub_1_1_if.html" title="Type selection (IF ? ThenType : ElseType) ">If&lt;(CUB_PTX_ARCH &gt;</a>= 300) &amp;&amp; ((LOGICAL_WARPS == 1) || POW_OF_TWO),</div>
<div class="line"><a name="l00160"></a><span class="lineno">  160</span>&#160;        WarpReduceShfl&lt;T, LOGICAL_WARPS, LOGICAL_WARP_THREADS&gt;,</div>
<div class="line"><a name="l00161"></a><span class="lineno">  161</span>&#160;        WarpReduceSmem&lt;T, LOGICAL_WARPS, LOGICAL_WARP_THREADS&gt; &gt;::Type InternalWarpReduce;</div>
<div class="line"><a name="l00162"></a><span class="lineno">  162</span>&#160;</div>
<div class="line"><a name="l00163"></a><span class="lineno">  163</span>&#160;<span class="preprocessor">    #endif // DOXYGEN_SHOULD_SKIP_THIS</span></div>
<div class="line"><a name="l00164"></a><span class="lineno">  164</span>&#160;<span class="preprocessor"></span></div>
<div class="line"><a name="l00165"></a><span class="lineno">  165</span>&#160;</div>
<div class="line"><a name="l00166"></a><span class="lineno">  166</span>&#160;<span class="keyword">private</span>:</div>
<div class="line"><a name="l00167"></a><span class="lineno">  167</span>&#160;</div>
<div class="line"><a name="l00169"></a><span class="lineno">  169</span>&#160;    <span class="keyword">typedef</span> <span class="keyword">typename</span> InternalWarpReduce::TempStorage _TempStorage;</div>
<div class="line"><a name="l00170"></a><span class="lineno">  170</span>&#160;</div>
<div class="line"><a name="l00171"></a><span class="lineno">  171</span>&#160;</div>
<div class="line"><a name="l00172"></a><span class="lineno">  172</span>&#160;    <span class="comment">/******************************************************************************</span></div>
<div class="line"><a name="l00173"></a><span class="lineno">  173</span>&#160;<span class="comment">     * Thread fields</span></div>
<div class="line"><a name="l00174"></a><span class="lineno">  174</span>&#160;<span class="comment">     ******************************************************************************/</span></div>
<div class="line"><a name="l00175"></a><span class="lineno">  175</span>&#160;</div>
<div class="line"><a name="l00177"></a><span class="lineno">  177</span>&#160;    _TempStorage &amp;temp_storage;</div>
<div class="line"><a name="l00178"></a><span class="lineno">  178</span>&#160;</div>
<div class="line"><a name="l00180"></a><span class="lineno">  180</span>&#160;    <span class="keywordtype">int</span> warp_id;</div>
<div class="line"><a name="l00181"></a><span class="lineno">  181</span>&#160;</div>
<div class="line"><a name="l00183"></a><span class="lineno">  183</span>&#160;    <span class="keywordtype">int</span> lane_id;</div>
<div class="line"><a name="l00184"></a><span class="lineno">  184</span>&#160;</div>
<div class="line"><a name="l00185"></a><span class="lineno">  185</span>&#160;</div>
<div class="line"><a name="l00186"></a><span class="lineno">  186</span>&#160;    <span class="comment">/******************************************************************************</span></div>
<div class="line"><a name="l00187"></a><span class="lineno">  187</span>&#160;<span class="comment">     * Utility methods</span></div>
<div class="line"><a name="l00188"></a><span class="lineno">  188</span>&#160;<span class="comment">     ******************************************************************************/</span></div>
<div class="line"><a name="l00189"></a><span class="lineno">  189</span>&#160;</div>
<div class="line"><a name="l00191"></a><span class="lineno">  191</span>&#160;    __device__ __forceinline__ _TempStorage&amp; PrivateStorage()</div>
<div class="line"><a name="l00192"></a><span class="lineno">  192</span>&#160;    {</div>
<div class="line"><a name="l00193"></a><span class="lineno">  193</span>&#160;        __shared__ <a class="code" href="structcub_1_1_warp_reduce_1_1_temp_storage.html" title="The operations exposed by WarpReduce require a temporary memory allocation of this nested type for th...">TempStorage</a> private_storage;</div>
<div class="line"><a name="l00194"></a><span class="lineno">  194</span>&#160;        <span class="keywordflow">return</span> private_storage;</div>
<div class="line"><a name="l00195"></a><span class="lineno">  195</span>&#160;    }</div>
<div class="line"><a name="l00196"></a><span class="lineno">  196</span>&#160;</div>
<div class="line"><a name="l00197"></a><span class="lineno">  197</span>&#160;</div>
<div class="line"><a name="l00198"></a><span class="lineno">  198</span>&#160;<span class="keyword">public</span>:</div>
<div class="line"><a name="l00199"></a><span class="lineno">  199</span>&#160;</div>
<div class="line"><a name="l00201"></a><span class="lineno"><a class="code" href="structcub_1_1_warp_reduce_1_1_temp_storage.html">  201</a></span>&#160;    <span class="keyword">struct </span><a class="code" href="structcub_1_1_warp_reduce_1_1_temp_storage.html" title="The operations exposed by WarpReduce require a temporary memory allocation of this nested type for th...">TempStorage</a> : <a class="code" href="structcub_1_1_uninitialized.html" title="A storage-backing wrapper that allows types with non-trivial constructors to be aliased in unions...">Uninitialized</a>&lt;_TempStorage&gt; {};</div>
<div class="line"><a name="l00202"></a><span class="lineno">  202</span>&#160;</div>
<div class="line"><a name="l00203"></a><span class="lineno">  203</span>&#160;</div>
<div class="line"><a name="l00204"></a><span class="lineno">  204</span>&#160;    <span class="comment">/******************************************************************/</span></div>
<div class="line"><a name="l00208"></a><span class="lineno">  208</span>&#160;</div>
<div class="line"><a name="l00209"></a><span class="lineno">  209</span>&#160;</div>
<div class="line"><a name="l00214"></a><span class="lineno"><a class="code" href="classcub_1_1_warp_reduce.html#aed6c8ead3a4c2fa56ae1d5851fb36848">  214</a></span>&#160;    __device__ __forceinline__ <a class="code" href="classcub_1_1_warp_reduce.html#aed6c8ead3a4c2fa56ae1d5851fb36848" title="Collective constructor for 1D thread blocks using a private static allocation of shared memory as tem...">WarpReduce</a>()</div>
<div class="line"><a name="l00215"></a><span class="lineno">  215</span>&#160;    :</div>
<div class="line"><a name="l00216"></a><span class="lineno">  216</span>&#160;        temp_storage(PrivateStorage()),</div>
<div class="line"><a name="l00217"></a><span class="lineno">  217</span>&#160;        warp_id((LOGICAL_WARPS == 1) ?</div>
<div class="line"><a name="l00218"></a><span class="lineno">  218</span>&#160;            0 :</div>
<div class="line"><a name="l00219"></a><span class="lineno">  219</span>&#160;            threadIdx.x / LOGICAL_WARP_THREADS),</div>
<div class="line"><a name="l00220"></a><span class="lineno">  220</span>&#160;        lane_id(((LOGICAL_WARPS == 1) || (LOGICAL_WARP_THREADS == <a class="code" href="structcub_1_1_ptx_arch_props.html" title="The architectural properties for the PTX version targeted by the active compiler pass. ">PtxArchProps</a>::WARP_THREADS)) ?</div>
<div class="line"><a name="l00221"></a><span class="lineno">  221</span>&#160;            LaneId() :</div>
<div class="line"><a name="l00222"></a><span class="lineno">  222</span>&#160;            threadIdx.x % LOGICAL_WARP_THREADS)</div>
<div class="line"><a name="l00223"></a><span class="lineno">  223</span>&#160;    {}</div>
<div class="line"><a name="l00224"></a><span class="lineno">  224</span>&#160;</div>
<div class="line"><a name="l00225"></a><span class="lineno">  225</span>&#160;</div>
<div class="line"><a name="l00229"></a><span class="lineno"><a class="code" href="classcub_1_1_warp_reduce.html#a7e026682e53d5af519912ab9a9215e3b">  229</a></span>&#160;    __device__ __forceinline__ <a class="code" href="classcub_1_1_warp_reduce.html#a7e026682e53d5af519912ab9a9215e3b" title="Collective constructor for 1D thread blocks using the specified memory allocation as temporary storag...">WarpReduce</a>(</div>
<div class="line"><a name="l00230"></a><span class="lineno">  230</span>&#160;        <a class="code" href="structcub_1_1_warp_reduce_1_1_temp_storage.html" title="The operations exposed by WarpReduce require a temporary memory allocation of this nested type for th...">TempStorage</a> &amp;temp_storage)             </div>
<div class="line"><a name="l00231"></a><span class="lineno">  231</span>&#160;    :</div>
<div class="line"><a name="l00232"></a><span class="lineno">  232</span>&#160;        temp_storage(temp_storage.Alias()),</div>
<div class="line"><a name="l00233"></a><span class="lineno">  233</span>&#160;        warp_id((LOGICAL_WARPS == 1) ?</div>
<div class="line"><a name="l00234"></a><span class="lineno">  234</span>&#160;            0 :</div>
<div class="line"><a name="l00235"></a><span class="lineno">  235</span>&#160;            threadIdx.x / LOGICAL_WARP_THREADS),</div>
<div class="line"><a name="l00236"></a><span class="lineno">  236</span>&#160;        lane_id(((LOGICAL_WARPS == 1) || (LOGICAL_WARP_THREADS == <a class="code" href="structcub_1_1_ptx_arch_props.html" title="The architectural properties for the PTX version targeted by the active compiler pass. ">PtxArchProps</a>::WARP_THREADS)) ?</div>
<div class="line"><a name="l00237"></a><span class="lineno">  237</span>&#160;            LaneId() :</div>
<div class="line"><a name="l00238"></a><span class="lineno">  238</span>&#160;            threadIdx.x % LOGICAL_WARP_THREADS)</div>
<div class="line"><a name="l00239"></a><span class="lineno">  239</span>&#160;    {}</div>
<div class="line"><a name="l00240"></a><span class="lineno">  240</span>&#160;</div>
<div class="line"><a name="l00241"></a><span class="lineno">  241</span>&#160;</div>
<div class="line"><a name="l00245"></a><span class="lineno"><a class="code" href="classcub_1_1_warp_reduce.html#aef629abf014a0f1f9646d3b9123fcaa6">  245</a></span>&#160;    __device__ __forceinline__ <a class="code" href="classcub_1_1_warp_reduce.html#aef629abf014a0f1f9646d3b9123fcaa6" title="Collective constructor using a private static allocation of shared memory as temporary storage...">WarpReduce</a>(</div>
<div class="line"><a name="l00246"></a><span class="lineno">  246</span>&#160;        <span class="keywordtype">int</span> warp_id,                           </div>
<div class="line"><a name="l00247"></a><span class="lineno">  247</span>&#160;        <span class="keywordtype">int</span> lane_id)                           </div>
<div class="line"><a name="l00248"></a><span class="lineno">  248</span>&#160;    :</div>
<div class="line"><a name="l00249"></a><span class="lineno">  249</span>&#160;        temp_storage(PrivateStorage()),</div>
<div class="line"><a name="l00250"></a><span class="lineno">  250</span>&#160;        warp_id(warp_id),</div>
<div class="line"><a name="l00251"></a><span class="lineno">  251</span>&#160;        lane_id(lane_id)</div>
<div class="line"><a name="l00252"></a><span class="lineno">  252</span>&#160;    {}</div>
<div class="line"><a name="l00253"></a><span class="lineno">  253</span>&#160;</div>
<div class="line"><a name="l00254"></a><span class="lineno">  254</span>&#160;</div>
<div class="line"><a name="l00258"></a><span class="lineno"><a class="code" href="classcub_1_1_warp_reduce.html#aac44f5e8003911f074156366969947e4">  258</a></span>&#160;    __device__ __forceinline__ <a class="code" href="classcub_1_1_warp_reduce.html#aac44f5e8003911f074156366969947e4" title="Collective constructor using the specified memory allocation as temporary storage. Threads are identified using the given warp and lane identifiers. ">WarpReduce</a>(</div>
<div class="line"><a name="l00259"></a><span class="lineno">  259</span>&#160;        <a class="code" href="structcub_1_1_warp_reduce_1_1_temp_storage.html" title="The operations exposed by WarpReduce require a temporary memory allocation of this nested type for th...">TempStorage</a> &amp;temp_storage,             </div>
<div class="line"><a name="l00260"></a><span class="lineno">  260</span>&#160;        <span class="keywordtype">int</span> warp_id,                           </div>
<div class="line"><a name="l00261"></a><span class="lineno">  261</span>&#160;        <span class="keywordtype">int</span> lane_id)                           </div>
<div class="line"><a name="l00262"></a><span class="lineno">  262</span>&#160;    :</div>
<div class="line"><a name="l00263"></a><span class="lineno">  263</span>&#160;        temp_storage(temp_storage.Alias()),</div>
<div class="line"><a name="l00264"></a><span class="lineno">  264</span>&#160;        warp_id(warp_id),</div>
<div class="line"><a name="l00265"></a><span class="lineno">  265</span>&#160;        lane_id(lane_id)</div>
<div class="line"><a name="l00266"></a><span class="lineno">  266</span>&#160;    {}</div>
<div class="line"><a name="l00267"></a><span class="lineno">  267</span>&#160;</div>
<div class="line"><a name="l00268"></a><span class="lineno">  268</span>&#160;</div>
<div class="line"><a name="l00269"></a><span class="lineno">  269</span>&#160;</div>
<div class="line"><a name="l00271"></a><span class="lineno">  271</span>&#160;    <span class="comment">/******************************************************************/</span></div>
<div class="line"><a name="l00275"></a><span class="lineno">  275</span>&#160;</div>
<div class="line"><a name="l00276"></a><span class="lineno">  276</span>&#160;</div>
<div class="line"><a name="l00309"></a><span class="lineno"><a class="code" href="classcub_1_1_warp_reduce.html#a3327a2b8c9bdce58f7af1e2485489eed">  309</a></span>&#160;    __device__ __forceinline__ T <a class="code" href="classcub_1_1_warp_reduce.html#a3327a2b8c9bdce58f7af1e2485489eed" title="Computes a warp-wide sum in each active warp. The output is valid in warp lane0. ">Sum</a>(</div>
<div class="line"><a name="l00310"></a><span class="lineno">  310</span>&#160;        T                   input)              </div>
<div class="line"><a name="l00311"></a><span class="lineno">  311</span>&#160;    {</div>
<div class="line"><a name="l00312"></a><span class="lineno">  312</span>&#160;        <span class="keywordflow">return</span> InternalWarpReduce(temp_storage, warp_id, lane_id).Sum&lt;<span class="keyword">true</span>, 1&gt;(input, LOGICAL_WARP_THREADS);</div>
<div class="line"><a name="l00313"></a><span class="lineno">  313</span>&#160;    }</div>
<div class="line"><a name="l00314"></a><span class="lineno">  314</span>&#160;</div>
<div class="line"><a name="l00352"></a><span class="lineno"><a class="code" href="classcub_1_1_warp_reduce.html#a2ccc6eb62a1e6caf145eb94a8cd58f0f">  352</a></span>&#160;    __device__ __forceinline__ T <a class="code" href="classcub_1_1_warp_reduce.html#a2ccc6eb62a1e6caf145eb94a8cd58f0f" title="Computes a partially-full warp-wide sum in each active warp. The output is valid in warp lane0...">Sum</a>(</div>
<div class="line"><a name="l00353"></a><span class="lineno">  353</span>&#160;        T                   input,              </div>
<div class="line"><a name="l00354"></a><span class="lineno">  354</span>&#160;        <span class="keywordtype">int</span>                 valid_items)        </div>
<div class="line"><a name="l00355"></a><span class="lineno">  355</span>&#160;    {</div>
<div class="line"><a name="l00356"></a><span class="lineno">  356</span>&#160;        <span class="comment">// Determine if we don&#39;t need bounds checking</span></div>
<div class="line"><a name="l00357"></a><span class="lineno">  357</span>&#160;        <span class="keywordflow">if</span> (valid_items &gt;= LOGICAL_WARP_THREADS)</div>
<div class="line"><a name="l00358"></a><span class="lineno">  358</span>&#160;        {</div>
<div class="line"><a name="l00359"></a><span class="lineno">  359</span>&#160;            <span class="keywordflow">return</span> InternalWarpReduce(temp_storage, warp_id, lane_id).Sum&lt;<span class="keyword">true</span>, 1&gt;(input, valid_items);</div>
<div class="line"><a name="l00360"></a><span class="lineno">  360</span>&#160;        }</div>
<div class="line"><a name="l00361"></a><span class="lineno">  361</span>&#160;        <span class="keywordflow">else</span></div>
<div class="line"><a name="l00362"></a><span class="lineno">  362</span>&#160;        {</div>
<div class="line"><a name="l00363"></a><span class="lineno">  363</span>&#160;            <span class="keywordflow">return</span> InternalWarpReduce(temp_storage, warp_id, lane_id).Sum&lt;<span class="keyword">false</span>, 1&gt;(input, valid_items);</div>
<div class="line"><a name="l00364"></a><span class="lineno">  364</span>&#160;        }</div>
<div class="line"><a name="l00365"></a><span class="lineno">  365</span>&#160;    }</div>
<div class="line"><a name="l00366"></a><span class="lineno">  366</span>&#160;</div>
<div class="line"><a name="l00367"></a><span class="lineno">  367</span>&#160;</div>
<div class="line"><a name="l00405"></a><span class="lineno">  405</span>&#160;    <span class="keyword">template</span> &lt;</div>
<div class="line"><a name="l00406"></a><span class="lineno">  406</span>&#160;        <span class="keyword">typename</span>            Flag&gt;</div>
<div class="line"><a name="l00407"></a><span class="lineno"><a class="code" href="classcub_1_1_warp_reduce.html#abc0cd1853c09b27fc45f564596163be4">  407</a></span>&#160;    __device__ __forceinline__ T <a class="code" href="classcub_1_1_warp_reduce.html#abc0cd1853c09b27fc45f564596163be4" title="Computes a segmented sum in each active warp where segments are defined by head-flags. The sum of each segment is returned to the first lane in that segment (which always includes lane0). ">HeadSegmentedSum</a>(</div>
<div class="line"><a name="l00408"></a><span class="lineno">  408</span>&#160;        T                   input,              </div>
<div class="line"><a name="l00409"></a><span class="lineno">  409</span>&#160;        Flag                head_flag)          </div>
<div class="line"><a name="l00410"></a><span class="lineno">  410</span>&#160;    {</div>
<div class="line"><a name="l00411"></a><span class="lineno">  411</span>&#160;        <span class="keywordflow">return</span> <a class="code" href="classcub_1_1_warp_reduce.html#a85d8612201876163a74a807c585b0af1" title="Computes a segmented reduction in each active warp where segments are defined by head-flags. The reduction of each segment is returned to the first lane in that segment (which always includes lane0). ">HeadSegmentedReduce</a>(input, head_flag, <a class="code" href="structcub_1_1_sum.html" title="Default sum functor. ">cub::Sum</a>());</div>
<div class="line"><a name="l00412"></a><span class="lineno">  412</span>&#160;    }</div>
<div class="line"><a name="l00413"></a><span class="lineno">  413</span>&#160;</div>
<div class="line"><a name="l00414"></a><span class="lineno">  414</span>&#160;</div>
<div class="line"><a name="l00451"></a><span class="lineno">  451</span>&#160;    <span class="keyword">template</span> &lt;</div>
<div class="line"><a name="l00452"></a><span class="lineno">  452</span>&#160;        <span class="keyword">typename</span>            Flag&gt;</div>
<div class="line"><a name="l00453"></a><span class="lineno"><a class="code" href="classcub_1_1_warp_reduce.html#a5b0134131d03909e43d24d6b0b50beb4">  453</a></span>&#160;    __device__ __forceinline__ T <a class="code" href="classcub_1_1_warp_reduce.html#a5b0134131d03909e43d24d6b0b50beb4" title="Computes a segmented sum in each active warp where segments are defined by tail-flags. The sum of each segment is returned to the first lane in that segment (which always includes lane0). ">TailSegmentedSum</a>(</div>
<div class="line"><a name="l00454"></a><span class="lineno">  454</span>&#160;        T                   input,              </div>
<div class="line"><a name="l00455"></a><span class="lineno">  455</span>&#160;        Flag                tail_flag)          </div>
<div class="line"><a name="l00456"></a><span class="lineno">  456</span>&#160;    {</div>
<div class="line"><a name="l00457"></a><span class="lineno">  457</span>&#160;        <span class="keywordflow">return</span> <a class="code" href="classcub_1_1_warp_reduce.html#a074ddcaf999d4e97376b145086e78ddb" title="Computes a segmented reduction in each active warp where segments are defined by tail-flags. The reduction of each segment is returned to the first lane in that segment (which always includes lane0). ">TailSegmentedReduce</a>(input, tail_flag, <a class="code" href="structcub_1_1_sum.html" title="Default sum functor. ">cub::Sum</a>());</div>
<div class="line"><a name="l00458"></a><span class="lineno">  458</span>&#160;    }</div>
<div class="line"><a name="l00459"></a><span class="lineno">  459</span>&#160;</div>
<div class="line"><a name="l00460"></a><span class="lineno">  460</span>&#160;</div>
<div class="line"><a name="l00461"></a><span class="lineno">  461</span>&#160;</div>
<div class="line"><a name="l00463"></a><span class="lineno">  463</span>&#160;    <span class="comment">/******************************************************************/</span></div>
<div class="line"><a name="l00467"></a><span class="lineno">  467</span>&#160;</div>
<div class="line"><a name="l00504"></a><span class="lineno">  504</span>&#160;    <span class="keyword">template</span> &lt;<span class="keyword">typename</span> ReductionOp&gt;</div>
<div class="line"><a name="l00505"></a><span class="lineno"><a class="code" href="classcub_1_1_warp_reduce.html#a1aa0a6e1a2c3feabbc20c27864df15c1">  505</a></span>&#160;    __device__ __forceinline__ T <a class="code" href="classcub_1_1_warp_reduce.html#a1aa0a6e1a2c3feabbc20c27864df15c1" title="Computes a warp-wide reduction in each active warp using the specified binary reduction functor...">Reduce</a>(</div>
<div class="line"><a name="l00506"></a><span class="lineno">  506</span>&#160;        T                   input,              </div>
<div class="line"><a name="l00507"></a><span class="lineno">  507</span>&#160;        ReductionOp         reduction_op)       </div>
<div class="line"><a name="l00508"></a><span class="lineno">  508</span>&#160;    {</div>
<div class="line"><a name="l00509"></a><span class="lineno">  509</span>&#160;        <span class="keywordflow">return</span> InternalWarpReduce(temp_storage, warp_id, lane_id).Reduce&lt;<span class="keyword">true</span>, 1&gt;(input, LOGICAL_WARP_THREADS, reduction_op);</div>
<div class="line"><a name="l00510"></a><span class="lineno">  510</span>&#160;    }</div>
<div class="line"><a name="l00511"></a><span class="lineno">  511</span>&#160;</div>
<div class="line"><a name="l00552"></a><span class="lineno">  552</span>&#160;    <span class="keyword">template</span> &lt;<span class="keyword">typename</span> ReductionOp&gt;</div>
<div class="line"><a name="l00553"></a><span class="lineno"><a class="code" href="classcub_1_1_warp_reduce.html#a176c3c913e3e077aab691a186f161d8e">  553</a></span>&#160;    __device__ __forceinline__ T <a class="code" href="classcub_1_1_warp_reduce.html#a176c3c913e3e077aab691a186f161d8e" title="Computes a partially-full warp-wide reduction in each active warp using the specified binary reductio...">Reduce</a>(</div>
<div class="line"><a name="l00554"></a><span class="lineno">  554</span>&#160;        T                   input,              </div>
<div class="line"><a name="l00555"></a><span class="lineno">  555</span>&#160;        ReductionOp         reduction_op,       </div>
<div class="line"><a name="l00556"></a><span class="lineno">  556</span>&#160;        <span class="keywordtype">int</span>                 valid_items)        </div>
<div class="line"><a name="l00557"></a><span class="lineno">  557</span>&#160;    {</div>
<div class="line"><a name="l00558"></a><span class="lineno">  558</span>&#160;        <span class="comment">// Determine if we don&#39;t need bounds checking</span></div>
<div class="line"><a name="l00559"></a><span class="lineno">  559</span>&#160;        <span class="keywordflow">if</span> (valid_items &gt;= LOGICAL_WARP_THREADS)</div>
<div class="line"><a name="l00560"></a><span class="lineno">  560</span>&#160;        {</div>
<div class="line"><a name="l00561"></a><span class="lineno">  561</span>&#160;            <span class="keywordflow">return</span> InternalWarpReduce(temp_storage, warp_id, lane_id).Reduce&lt;<span class="keyword">true</span>, 1&gt;(input, valid_items, reduction_op);</div>
<div class="line"><a name="l00562"></a><span class="lineno">  562</span>&#160;        }</div>
<div class="line"><a name="l00563"></a><span class="lineno">  563</span>&#160;        <span class="keywordflow">else</span></div>
<div class="line"><a name="l00564"></a><span class="lineno">  564</span>&#160;        {</div>
<div class="line"><a name="l00565"></a><span class="lineno">  565</span>&#160;            <span class="keywordflow">return</span> InternalWarpReduce(temp_storage, warp_id, lane_id).Reduce&lt;<span class="keyword">false</span>, 1&gt;(input, valid_items, reduction_op);</div>
<div class="line"><a name="l00566"></a><span class="lineno">  566</span>&#160;        }</div>
<div class="line"><a name="l00567"></a><span class="lineno">  567</span>&#160;    }</div>
<div class="line"><a name="l00568"></a><span class="lineno">  568</span>&#160;</div>
<div class="line"><a name="l00569"></a><span class="lineno">  569</span>&#160;</div>
<div class="line"><a name="l00608"></a><span class="lineno">  608</span>&#160;    <span class="keyword">template</span> &lt;</div>
<div class="line"><a name="l00609"></a><span class="lineno">  609</span>&#160;        <span class="keyword">typename</span>            ReductionOp,</div>
<div class="line"><a name="l00610"></a><span class="lineno">  610</span>&#160;        <span class="keyword">typename</span>            Flag&gt;</div>
<div class="line"><a name="l00611"></a><span class="lineno"><a class="code" href="classcub_1_1_warp_reduce.html#a85d8612201876163a74a807c585b0af1">  611</a></span>&#160;    __device__ __forceinline__ T <a class="code" href="classcub_1_1_warp_reduce.html#a85d8612201876163a74a807c585b0af1" title="Computes a segmented reduction in each active warp where segments are defined by head-flags. The reduction of each segment is returned to the first lane in that segment (which always includes lane0). ">HeadSegmentedReduce</a>(</div>
<div class="line"><a name="l00612"></a><span class="lineno">  612</span>&#160;        T                   input,              </div>
<div class="line"><a name="l00613"></a><span class="lineno">  613</span>&#160;        Flag                head_flag,          </div>
<div class="line"><a name="l00614"></a><span class="lineno">  614</span>&#160;        ReductionOp         reduction_op)       </div>
<div class="line"><a name="l00615"></a><span class="lineno">  615</span>&#160;    {</div>
<div class="line"><a name="l00616"></a><span class="lineno">  616</span>&#160;        <span class="keywordflow">return</span> InternalWarpReduce(temp_storage, warp_id, lane_id).template SegmentedReduce&lt;true&gt;(input, head_flag, reduction_op);</div>
<div class="line"><a name="l00617"></a><span class="lineno">  617</span>&#160;    }</div>
<div class="line"><a name="l00618"></a><span class="lineno">  618</span>&#160;</div>
<div class="line"><a name="l00619"></a><span class="lineno">  619</span>&#160;</div>
<div class="line"><a name="l00658"></a><span class="lineno">  658</span>&#160;    <span class="keyword">template</span> &lt;</div>
<div class="line"><a name="l00659"></a><span class="lineno">  659</span>&#160;        <span class="keyword">typename</span>            ReductionOp,</div>
<div class="line"><a name="l00660"></a><span class="lineno">  660</span>&#160;        <span class="keyword">typename</span>            Flag&gt;</div>
<div class="line"><a name="l00661"></a><span class="lineno"><a class="code" href="classcub_1_1_warp_reduce.html#a074ddcaf999d4e97376b145086e78ddb">  661</a></span>&#160;    __device__ __forceinline__ T <a class="code" href="classcub_1_1_warp_reduce.html#a074ddcaf999d4e97376b145086e78ddb" title="Computes a segmented reduction in each active warp where segments are defined by tail-flags. The reduction of each segment is returned to the first lane in that segment (which always includes lane0). ">TailSegmentedReduce</a>(</div>
<div class="line"><a name="l00662"></a><span class="lineno">  662</span>&#160;        T                   input,              </div>
<div class="line"><a name="l00663"></a><span class="lineno">  663</span>&#160;        Flag                tail_flag,          </div>
<div class="line"><a name="l00664"></a><span class="lineno">  664</span>&#160;        ReductionOp         reduction_op)       </div>
<div class="line"><a name="l00665"></a><span class="lineno">  665</span>&#160;    {</div>
<div class="line"><a name="l00666"></a><span class="lineno">  666</span>&#160;        <span class="keywordflow">return</span> InternalWarpReduce(temp_storage, warp_id, lane_id).template SegmentedReduce&lt;false&gt;(input, tail_flag, reduction_op);</div>
<div class="line"><a name="l00667"></a><span class="lineno">  667</span>&#160;    }</div>
<div class="line"><a name="l00668"></a><span class="lineno">  668</span>&#160;</div>
<div class="line"><a name="l00669"></a><span class="lineno">  669</span>&#160;</div>
<div class="line"><a name="l00670"></a><span class="lineno">  670</span>&#160;</div>
<div class="line"><a name="l00672"></a><span class="lineno">  672</span>&#160;};</div>
<div class="line"><a name="l00673"></a><span class="lineno">  673</span>&#160;       <span class="comment">// end group WarpModule</span></div>
<div class="line"><a name="l00675"></a><span class="lineno">  675</span>&#160;</div>
<div class="line"><a name="l00676"></a><span class="lineno">  676</span>&#160;}               <span class="comment">// CUB namespace</span></div>
<div class="line"><a name="l00677"></a><span class="lineno">  677</span>&#160;CUB_NS_POSTFIX  <span class="comment">// Optional outer namespace(s)</span></div>
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